Fhank s



tlnttd tma @tutti Gtjillltt.

FRANK lS. BISSELL, OF PITTSBURG, PENNSYLVANIA.

Letters Patent No. 106,772, dated August 30, 1870. .;Hm

FIRE-PLACE GRATE.

The Schedule referred to in these Letters Patent and making part of thesame To all whom it may concern;

, full and exact specification ofthe same, wherein I have set forth thenature and principles oi' my said improvement, by which my invention maybe distinguished from others ot'a similar class, together with suchparts as I claim and desire to secure by Letters Patent.

My invention relates to that class oi' gratos commonly known as thelowdowu grate, and the nature"thereof consists in providingr a cold-airbox or chamber' for the purpose of raising the bottom basket o r gratingabove thelevel of the hearth of the lireplace, thereby creating areceptacle into which cold air may be admitted, and obviating theserious objections heretofore urged against the ordinary low-down grate,to wit: that thevery high heat created on the level of the stone ormarble hearth caused the same to break or crack in pieces, and alsomaterial) y lessenng the distance between the topv rim of the arch orfront of the chimney-line, (in the rear of which the smoke of said gratepasses up the cl1iuniey,) -and the top of the front of the grate-basket,thus preventing the pulling out ot' smoke.

1n the accompanyingdrawing, which illustrates my invention and forms apart of the specification thereor, in which corresponding parts' areillustrated by similar letters- Figure 1 is a view in perspective,illustrating a lowdown grate of the ordinary form, with my inventionapplied thereto.

Figure 2 is a perspective view of the cold-air box.

Figure 3 illustrates the position oi' the cold-'air chamber and grate,above an ash-pit and cold-air due ol the ordinary form.

\Vithin the casing A is the bottom grate, B, which fsa-id bottom grate15 is placed at the top of the coldair box C. Y

C designates the cold-air box or chamber, on the top oi' which the saidbottom grate B rests, and the bottom of which is entirely open, in orderthat the cold air may be freely admitted or retarded from below. Thesaid cold-air box or chamber fits closely between Lthe two ja1ns.oi` thearch or grate-iront beneath the top ot' the front oi' the grate-basket,and may be removed, when it is desirable, with the greatest facility.The said cold-air box being constantly 'supplied with cold air. (or shutoft' at pleasure,) serves to protect the hearth from the downward'radiation of heat from the grate-basket, and, by lessening the openingbetween the top ot' the front of the grate-basket and the top rim ofthearch, prevents thejputiiug out of smoke.

Having thus described the construction and operation ot' myinvention,

I claim and desire to secure by Letters Patent- The combination ofcasing A, grate-basket B, and cold-air chamber O, when constructed andoperating as described. L

In testimony that I claim the foregoing, 1 have hereunto set my handthis 30th day ot' April, 1870. FRANK S. BISSELL.

Witnesses z J. DONALDSON, WILL'rAM H. CoLLINGswoon.

